Parameters

Table 17-3 CHANGE Procedures Parameters

Parameter

Description

name

Name of the refresh group for which you want to alter the refresh interval.

next_date

Next date that you want a refresh to occur. By default, this date remains unchanged.

interval

Function used to calculate the next time to refresh the materialized views in the refresh group. This interval is evaluated immediately before the refresh. Thus, you should select an interval that is greater than the time it takes to perform a refresh. By default, the interval remains unchanged.

implicit_destroy

Allows you to reset the value of the implicit_destroy flag. If this flag is set, then Oracle automatically deletes the group if it no longer contains any members. By default, this flag remains unchanged.

rollback_seg

Allows you to change the rollback segment used. By default, the rollback segment remains unchanged. To reset this parameter to use the default rollback segment, specify NULL, including the quotes. Specifying NULL without quotes indicates that you do not want to change the rollback segment currently being used.

push_deferred_rpc

Used by updatable materialized views only. Set this parameter to true if you want to push changes from the materialized view to its associated master table or master materialized view before refreshing the materialized view. Otherwise, these changes may appear to be temporarily lost. By default, this flag remains unchanged.

refresh_after_errors

Used by updatable materialized views only. Set this parameter to true if you want the refresh to proceed even if there are outstanding conflicts logged in the DEFERROR view for the materialized view's master table or master materialized view. By default, this flag remains unchanged.

purge_option

If you are using the parallel propagation mechanism (that is, parallelism is set to 1 or greater), then:

0 = do not purge

1 = lazy (default)

2 = aggressive

In most cases, lazy purge is the optimal setting. Set purge to aggressive to trim back the queue if multiple master replication groups are pushed to different target sites, and updates to one or more replication groups are infrequent and infrequently pushed. If all replication groups are infrequently updated and pushed, then set purge to do not purge and occasionally execute PUSH with purge set to aggressive to reduce the queue.

parallelism

0 specifies serial propagation.

n > 1 specifies parallel propagation with n parallel processes.

1 specifies parallel propagation using only one parallel process.

heap_size

Maximum number of transactions to be examined simultaneously for parallel propagation scheduling. Oracle automatically calculates the default setting for optimal performance.

Note: Do not set this parameter unless directed to do so by Oracle Support Services.